Shuttle for sewing-machines



A.-M. LESLIE. SHUTTLE FOR SEWING MACHINES.

No. 444,756. Patented-Jan. 13, 1891.

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ARTHUR M. LESLIE, OF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 444,756, dated January 18, 1891.

Application filed August 2, 1886. Renewed June 28, 1890. Serial No. 357,122. (No model.)

To all whom it may concern:

Be it known that I, ARTHUR M. LESLIE, a citizen of the United States, residing at Ohicago, in the State of Illinois, have invented a new and useful Improvement in Shuttles and Bobbin-Cases, of which the following is a specification.

This invention relates to the construction of the rotary shuttles and non-rotary bobbincases of those lock-stitch sewing-machines in which the shuttle revolves or rotates continuously while the machine isin operation, and to the construction of their tension devices and bobbin-retainers. Its objects are, first, to facilitate removing and replacing the bobbin, the retainer being so located as to be actuated by the grasp which takes hold of the bobbin-case for withdrawing it; secondly, to more securely fasten the bobbiu-case in working position by said retainer and accessories thereof; thirdly, to accommodate a thick bobbin,so asto obviate frequently replenishin gthe thread and at the same time to more effectively guard against the escape of thread over the disks of the bobbin and to isolate the bobbin from the rotary shuttle; fourthly, to facilitate threading the bobbin-case and tension device; fifthly, to accommodate a long-bowed tensionspring so adapted to be adjusted without straining it, and, sixthly, to facilitate regulating the tension with nicety.

Theinvention consists in certain novel combinations and arrangements of parts, some of them peculiarly constructed, as hereinafter set forth, whereby said objects respectively are accomplished.

A sheet of drawings accompanies this specification as part thereof.

Figure 1 of the drawings is a face view of a shuttle and bobbin-case, illustrating this in vention. Figs. 2 and 3 are edge views thereof from opposite points of view. Fig. 4 represents a section through all on'the line 4 4, Fig. 1. Fig. 5 represents a section of the empty shuttle proper on the line 5 5, Fig. 1; and Fig. 6 represents an edge view of the bobbin and bobbin-case removed and separated.

Like letters of reference indicate corresponding parts in the several figures.

The shuttle proper A (represented in the drawings) is in its general features of a construction heretofore patent-ed by me, and,

apart from the internal construction hereinafter specified, may for the purposes of my present invention be of any approved make.

The bobbin B is a thick disk bobbin with convex ends or faces, and the bobbin-case C (hereinafter termed the case forms the peripheral and outer bearings forthe bobbin, so as to isolate the latter to this extent from the shuttle and is removable therewith from the shuttle-chamber, as illustrated by Figs. 5 and 6.

The case 0 is rendered non-rotary, as heretofore, by a holding-arm a, fast upon its face or outer end, to engage with some part of the machine which is stationary relatively to the shuttle-motion, and to facilitate removing and replacing the case, and therewith the bobbin B, the retainer 1), in the form of a onepart spring-catch, is attached to the periphery of the case, engaging a circumferential shoul-' der 0 within the shuttle-chamber, as best seen in Fig. 4, and has a thumb-lug b at its outer end, which, when the parts are united, projects at the face of the shuttle, as seen in Figs. 1, 3,

and 4, substantially parallel to the inner edge of said arm a, so that the two may be conveniently grasped between finger and thumb to unfasten and withdraw the case. In replacing the case the arm and retainer are less tightly grasped, so that the latter may snap behind the shoulder c. Arounded protuberance d, Fig. 4, diametrically opposite the ef fective pointof the retainer 17 and in the same plane, is forced behind the shoulder c by the spring-pressure of the retainer, and materially assists to keep the annular case and bobbin in correct position. The retainer is so set that when its pointand said protuberance are both properly behind the shoulder c it is completely relaxed, so as to prevent friction. The protuberance cl may in practice be dispensed with, the lateral play of the case beingso limited as to prevent the escape of the retainer 1) from behind the shoulder cwithout first retracting the retainer. The bearings of the case at the face of the shuttle are formed by the practically cylindrical portion of the periphery of the case in front or outside of said shoulder 0. (Compare Figs. 1, 4., and 6.)

A bobbin of maximum thickness is accommodated by making both case and shuttle annular with beveled inner flanges e f, for the from the latter.

outer and inner bearings of the bobbin. (See Fig. 4.) The convex ends of the bobbin may consequently project to the face and back of the shuttle and a large supply of thread be accommodated between them, while the escape of thread over the bobbin-disks is less liable to occur in proportion to the distance between the disks. Such escape of the thread is-further prevented by the case itself, which extends back to said flange f beyond the edge of the back disk of the bobbin and ordinarily keeps the latter out of contact with said flange, so as to render the bobbin wholly unaffected by the motion of the shuttle. The back edge of the case has a peripheral flange g to steady it withinthe shuttle-chamber. Moreover, the thread if is-drawn off through a radial hole 71, Fig. 6, .in the case 0, midway between the bobbi'ndisks,so as to give it a'tendeney-away The thread i is drawn into said hole.hthrougha-slit extending thereto from the back edge of the case, as seen in Fig. -6, and from the hole it passesthrough a peripheral groove tin the case to a self-threading hole Figs. 1 and 2, in a flange of the arm a, perpendicular to the face of the case forming its'said inner edge, and thence between said flange and a tensiomspriug s, as :seen in Fig. 1, to the throat-plate of the machine. The outer-cnd :of the slit of said hole j in the arm .a is masked by a spring-guard 7c in customary manner. The arm a is of trough shape, as seen in Figs. 1 to 4, with both edges formedby flanges perpendicular to the face of the case and properly curved as to their outer-edges. Between these flanges a long bowed tension=spring s is readily masked. Its fixed end is attached to said flange, with which its free end coacts, as seen in Fig. 1. Attached to the other flange of the arm is a drilled and screw-tapped lug g, which forms the fixed nut of a regulating-screw r, the point of which coacts with the b nd of said bowed spring-as clearly seen insaid figure, soas to adjust thespring, and thus regulate the tension withggreat nicety.- In working position said'serewis vertical or substantially vertical,

of the case, and with a retainer in the form of,

a spring-catch attached to its periphery and raving a thumb-lug substantially parallel to said arm edge, for the purpose set forth.

2. In combination with a rotary shuttle having a circular chamber provided with a circumferential catch shoulder, a non-rotary bobbin-case having a retainer in the form of a spring-catch attached to its periphery, and a diametrically-opposite rounded protuberance which likewise engages with said catchshoulder, substantially as herein specified, for the purpose set forth.

3. The combination, substantially as herein specified, of an annular rotary shuttle having a circular chamber provided with a circumferential beveled flange at the back of the shuttle, an annular non-rotary bobbin-case fitted to said chamber, extending inward to said flange, and having.a-eorresponding beveled flange at its face, and having a radial thread-guide midway between its inner edge and said face, and a disk-bobbin running .on its edges within said case, for the purposes set forth.

4. In combination with a rotaryshuttle and its bobbin, a non-rotary bobbin-case having a holding-arm and a tension device on'its face, and constructed with a radial thread-guide midway between its inner edge and its face, a

slit extending thereto from said inner edge, a

peripheral groove extending thence to said arm, and a self-threading guide in alongitudinal flange of said arm perpendicular to the face of the case, the tension-sprin g pressingagainst said flange and extending longitudinally thereof, substantially as herein specified.

5. In combination with arotaryshuttleand its bobbin,'a nonr.otary bobbin-case having on its face a holding-arm with alongitudinal flange perpendicular to the face of the case, and provided with a lon g-bowed tension-spring attached at one end tosaid flange and pressing against the :same beyond a thread-guide therein, substantially as herein specified.

6. In combination with arotary shuttlean'd its bobbin, a non-rotary bobbin-case having on its face a holding-arm with a longitudinal flange perpendicular to'the face of thecase, a thread-guide, and a fixed drilled and screwtapped lug, and provided with a bowed tension-spring pressing against :said flange beyond said guide, and a vertical regulatingscrew which works in said lug and coacts'with the bendof the spring, substantially as herein specified, for the purpose setforth.

Signed at Chicago this 17th dayof July, 1886.

ARTHUR M. LESLIE.

\Vitnesses:

J AS. L. EWIN, WoLFREn N. Low.

ICC 

